See with these Acers they don't follow the mini PCIE interface spec at all. They use the same 1.8" drives found in MP3 players. I've found all sorts of solid state and spindle drives I could use, but they're either used (old Zunes and iPods) or cost prohibitive. With two SD slots I can slap in 32GB of fast-enough storage pretty cheap. And thus far I really haven't needed any more anyway. I've been streaming XMRadio for music and Netflix for movies. Done, and done. I'm trying really hard to keep this an internet appliance.